Multi friction side bearing for a railcar truck

Abstract

A self leveling bearing for use on a freight railcar truck bolster having a major body with an arcuate undersurface and an upper friction face and a secondary friction body biased outwardly of a cavity within the upper friction face.

What is claimed is: 
     
       1. A friction bearing for use between a vehicle body and a truck supporting said body, said bearing comprising: a major friction body having a flat first friction face;   a cavity in said major friction body; and   a secondary friction body having a flat secondary friction face seated in said cavity, said first and said secondary friction faces being parallel and said secondary friction face being movable between positions spaced from and coplanar with said first friction face.   
     
     
       2. The friction bearing of claim 1 wherein said major friction body has an arcuate underside opposite said first friction face. 
     
     
       3. The friction bearing of claim 1 wherein said first and secondary friction faces having different coefficients of friction. 
     
     
       4. The friction bearing of claim 1 including biasing means within said cavity urging said secondary friction body outwardly thereof. 
     
     
       5. A friction bearing for use between a vehicle body and a truck supporting said body, said bearing comprising: a major friction body having a flat first friction face;   a pair of cavities in said major friction body and said first friction face;   secondary friction bodies having flat secondary friction faces seated in said cavities;   and a biasing means within each said cavity urging said secondary friction body outwardly thereof.   
     
     
       6. The friction bearing of claim 5, wherein said major friction body has a spherical undersurface opposite said first friction face. 
     
     
       7. The friction bearing of claim 5 wherein said first friction face consists of a material different from said secondary friction faces. 
     
     
       8. The friction bearing of claim 5 wherein said first and second friction faces have different coefficients of friction. 
     
     
       9. The friction bearing of claim 5 wherein said first friction face has a coefficient of friction that is less than the secondary friction face. 
     
     
       10. The friction bearing of claim 5 wherein said major friction body has an arcuate undersurface opposite said first friction face. 
     
     
       11. A friction bearing for use between a railcar body and a railcar truck pivotally supporting said body, said bearing comprising: a major friction body having a flat first friction face and a spherical underside opposite said first friction face;   a pair of cylindrical cavities located in and surrounded by said first friction face, said cavities extending into said major friction body;   a spring seated within each said cavity; and   secondary friction bodies in the form of discs having flat secondary friction faces mounted on each said spring, said secondary friction faces substantially conforming to the cavities in said first face and held parallel to said first face.